Milliner does have a high-ankle sprain, an MRI confirmed, Rex Ryan said after practice on Monday.
Chris Ivory and Nick Mangold were both on the stationary bikes to open practice on Monday. Mangold was held out with a toe injury, Ryan said.
Jalen Saunders was also on the bikes following Friday's medical incident while driving to the Jets facility.
Jeff Cumberland and Antwan Barnes were working with staff on the sidelines.
Ras-I Dowling sat out with a groin injury.